Harnahai is a village in Powayan tehsil in district of Shahjahanpur, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Harnahai was 2,224 which includes 1,202 males and 1,022 females. Harnahai covers 127.03 ha area. Pincode of Harnahai is 242405.